2 ms·After CPAP fail, I tried one of these and it worked GREAT. N=1.by euroderf 3y agoAfter CPAP fail, I tried one of these and it worked GREAT. N=1.rs999gti 3y agoCan you buy them over the counter or does it require a visit to a provider for a prescription?euroderf 3y agoIt needs a fitting. IIRC they took a gel impression.